Nipple



FIG. 1 is a front elevational view of a nipple showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a cross-sectional view taken along line 1—1 in FIG. 1; and,

FIG. 5 is a perspective view thereof.

The ornamental design for a nipple, as shown and described.